sandynz opened a new issue #16351:
URL: https://github.com/apache/shardingsphere/issues/16351
## Bug Report
### Which version of ShardingSphere did you use?
master branch, commit 63ab54bd886623a2583c86dda8beb3128079dbfe
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy
### Expected behavior
Proxy start without exception.
### Actual behavior
Exception stack trace:
```
Exception in thread "main" java.lang.NullPointerException
at
org.apache.shardingsphere.infra.federation.optimizer.metadata.FederationMetaData.<init>(FederationMetaData.java:38)
at
org.apache.shardingsphere.infra.federation.optimizer.context.OptimizerContextFactory.create(OptimizerContextFactory.java:47)
at
org.apache.shardingsphere.mode.metadata.MetaDataContextsBuilder.build(MetaDataContextsBuilder.java:116)
at
org.apache.shardingsphere.mode.manager.cluster.ClusterContextManagerBuilder.build(ClusterContextManagerBuilder.java:79)
at
org.apache.shardingsphere.proxy.initializer.BootstrapInitializer.createContextManager(BootstrapInitializer.java:72)
at
org.apache.shardingsphere.proxy.initializer.BootstrapInitializer.init(BootstrapInitializer.java:57)
at org.apache.shardingsphere.proxy.Bootstrap.main(Bootstrap.java:47)
```
### Reason analyze (If you can)
<img width="1173" alt="图片"
src="https://user-images.githubusercontent.com/42492540/160041532-bd61fb85-16c4-4ae2-b258-7d5a17c5b6d7.png";>
`entry.getValue().getSchema()` return null.
From `ShardingSphereMetaData.java`
```
public ShardingSphereSchema getSchema() {
return schemas.get(name);
}
```
From screenshot, `schemas`'s key is `datasources`, but `name` is
`dataSources`, it doesn't match.
Why `dataSources` exists in registry center? It's the old node, it's still
kept after `versions` added.
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
Run `Bootstrap` in IDE.
### Example codes for reproduce this issue (such as a github link).
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![https://user-images.githubusercontent.com/42492540/160041532-bd61fb85-16c4-4ae2-b258-7d5a17c5b6d7.png"](https://user-images.githubusercontent.com/42492540/160041532-bd61fb85-16c4-4ae2-b258-7d5a17c5b6d7.png"){kind=link}